PPIRS.GOV has 9 keywords

First position — 2 keywords

Keywords Analytic

the 1th position for ppirs.gov

#	Keyword	Results	Change	Check Date
1	pastperformance	6 280 000	0	2016-01-16
1	past performance	261 000 000	0	2013-10-17

positions above than 3th ppirs.gov

#	Keyword	Results	Change	Check Date
16	retrieval.	49 600 000	1	2013-04-30
16	retrieval	52 200 000	-4	2013-10-25
29	retrieval systems	7 490 000	8	2014-08-02
30	past performances	3 400 000	0	2014-10-24
31	pastperformances	17 200 000	0	2014-01-08
32	past	1 980 000 000	-13	2014-10-21
48	information retrieval	15 400 000	-34	2014-12-10